<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下拉菜单测试</title>
    <style>
        .dropbtn{
            background-color: #4CAF50;
            color: white;
            padding: 16px;
            font-size: 16px;
            border: none;
            cursor: pointer;
        }
        .dropdown{
            position: relative;
            display: inline-block;
        }

        .dropdown-content{
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
        }
        .dropdown-content > a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }
        .dropdown-content a:hover{
            background-color: #f1f1f1;
        }
        .dropdown:hover .dropdown-content{
            display: block;
        }
        .dropdown:hover .dropbtn{
            background-color: #3e8e41;
        }
    </style>
</head>
<body>
    <div class="dropdown">
        <button class="dropbtn">下拉菜单</button>
        <div class="dropdown-content">
            <a href="#">类型1</a>
            <a href="#">类型2</a>
            <a href="#">类型3</a>
        </div>
    </div>
</body>
</html>